Keystones — Capstone
Five GCSE retrieval questions · 28 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 15
Answer: 2(x + 5)² - 65 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 79°. Give your answer to 2 decimal places
Answer: 121.23cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 69, 84, 29, 23, 59, 56, 31
Answer: Mean = 55.25, Median = 57.5, Range = 68